Audio system



FIG. 1 is a front left perspective view of a audio system showing our new design, the front right perspective view being a mirror image thereof;

FIG. 2 is a front view of the audio system of FIG. 1; and,

FIG. 3 is a top view of the audio system of FIG. 1.

The broken line showing in the drawing disclosure is for illustrative purposes only and form no part thereof. The undisclosed rear and bottom view are unornamented. 

The ornamental design for an audio system, as shown and described. 